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Gas Planning (Rock)

Gas Planning - Rock Bottom

The gas to bring you and your buddy up from depth if something goes wrong.

Metric shows depths in metres and pressures in bar; Imperial in feet and atm. Your choice is kept across every formula for this visit.
Recreational limits mixes to 21–40% oxygen (nitrox). Technical allows any oxygen percentage up to 100% and trimix (helium). Granular lets you type exact values, to a decimal place. Your choice is kept across every formula for this visit.
Fresh water is less dense than salt water, so the same pressure is reached a little deeper (10.3 m per bar, against 10 m in salt water).
Your dive, cylinder and buddy
Your breathing rate at the surface, as a volume: from the RMV screen, or your computer. It is true for any cylinder.
The cylinder you will dive. Its water capacity turns litres into bar.
The deepest point of the dive: where something going wrong costs the most gas.
How fast you ascend. Agencies teach 9 or 10 m (30 or 33 ft) a minute; some allow up to 18 or 20 (60 or 66).
How much harder you breathe when something goes wrong: 2 is a common teaching figure.
The minutes at depth sorting the problem out before the ascent starts.
Ticked: the gas for you AND your buddy, from your cylinder (one of you may be out of gas). Unticked: you alone.

I think this is an error

This sends the calculation on this screen, exactly as it is now.